We present a semi-custom design methodology based on transistor tuning to optimize the design performance. Compared with other transistor tuning approaches, our tuning process takes the cross-talk effect into account ...We present a semi-custom design methodology based on transistor tuning to optimize the design performance. Compared with other transistor tuning approaches, our tuning process takes the cross-talk effect into account and prominently reduces the complexity for circuit simulation and analysis by decomposing the circuit network utilizing graph theory. Furthermore, the incremental placement and routing for the corresponding transistor tuning in conventional approaches is not required in our methodology, which might induce timing graph variation and additional iterations for design convergence. This methodology combines the flexible automated circuit tuning and physical design tools to provide more opportunities for design optimization throughout the design cycle.展开更多
A High Temperature Gas Cooled Reactor （HTGR） with an outlet coolant temperature of 950 ℃ is considered as an efficient reactor to couple with the thermo-chemical Sulfur Iodine （SI） cycle for a hydrogen production...A High Temperature Gas Cooled Reactor （HTGR） with an outlet coolant temperature of 950 ℃ is considered as an efficient reactor to couple with the thermo-chemical Sulfur Iodine （SI） cycle for a hydrogen production. The test loop was installed in the Korea Atomic Energy Research Institute （KAERI） facility to confirm the integrity of the sulfur trioxide decomposer, one of the key components in the test loop, under HTGR operating conditions. In this paper, the simulation using Aspen plus, a chemical process simulator, was made to evaluate the performance of a sulfur trioxide decomposer. The simulation indicated that at least 10 kW heat needs to be supplied to the sulfur trioxide decomposer in the test loop when the sulfuric acid flowrate is 0.5 kg/min. The simulation flowsheet was obtained and the material balance around the sulfur trioxide decomposer was determined in case of 10 kW heat input and 0.5 kg/min flowrate of liquid sulfuric acid. The parametric study was carried out for sulfur trioxide decomposer. It indicated that the moles of sulfur dioxide produced at the decomposer increases as the operating temperature increases and is decreasing as the operating pressure becomes higher at a given temperature. The parametric study also indicated water vapor removal out of the decomposer is a less effective method to increase the sulfur trioxide conversion ratio.展开更多
基金Project (No. 2005AA1Z1271) supported by the Hi-Tech Researchand Development Program (863) of China
文摘We present a semi-custom design methodology based on transistor tuning to optimize the design performance. Compared with other transistor tuning approaches, our tuning process takes the cross-talk effect into account and prominently reduces the complexity for circuit simulation and analysis by decomposing the circuit network utilizing graph theory. Furthermore, the incremental placement and routing for the corresponding transistor tuning in conventional approaches is not required in our methodology, which might induce timing graph variation and additional iterations for design convergence. This methodology combines the flexible automated circuit tuning and physical design tools to provide more opportunities for design optimization throughout the design cycle.
文摘A High Temperature Gas Cooled Reactor （HTGR） with an outlet coolant temperature of 950 ℃ is considered as an efficient reactor to couple with the thermo-chemical Sulfur Iodine （SI） cycle for a hydrogen production. The test loop was installed in the Korea Atomic Energy Research Institute （KAERI） facility to confirm the integrity of the sulfur trioxide decomposer, one of the key components in the test loop, under HTGR operating conditions. In this paper, the simulation using Aspen plus, a chemical process simulator, was made to evaluate the performance of a sulfur trioxide decomposer. The simulation indicated that at least 10 kW heat needs to be supplied to the sulfur trioxide decomposer in the test loop when the sulfuric acid flowrate is 0.5 kg/min. The simulation flowsheet was obtained and the material balance around the sulfur trioxide decomposer was determined in case of 10 kW heat input and 0.5 kg/min flowrate of liquid sulfuric acid. The parametric study was carried out for sulfur trioxide decomposer. It indicated that the moles of sulfur dioxide produced at the decomposer increases as the operating temperature increases and is decreasing as the operating pressure becomes higher at a given temperature. The parametric study also indicated water vapor removal out of the decomposer is a less effective method to increase the sulfur trioxide conversion ratio.
